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Руководство по эксплуатации Страница: 218

Kurzweil PC3A7 [218/423] Flanger

Effects and Effect Mode

Effects Overview

9-19

Flanger

Flanging is the process of adding or subtracting a signal with a time-displaced replica of itself,

which results in a series of notches in the frequency spectrum, generally referred to as a comb

lter. In the PC3A, the anger is a multi-tap delay line, all (but one) of whose taps can have their

lengths modulated up and down by a low frequency oscillator (LFO). The rate of the LFO is

expressed in Tempo.

StatDlyLvl (Static Delay Level) is the level of the rst, non-moving tap. Negative values invert

the polarity of the tap. The range is -100 to 100%; 0% turns the tap o.

DlyCrs and DlyFin are the coarse and ne length controls for the Static delay (StatDly…) and for

the minimum value of the moving delays (Dlyn…). The coarse range is 0 to 228 ms, and the ne

range adjusts the coarse range in samples (= 1/48,000 sec = 20.8µsec) from -127 to 127.

Xcurs Crs and Xcurs Fin determine how far the LFO-modulated delay taps can move from the

center of their ranges. The total range of the LFO sweep is twice the excursion. If the excursion is

set to 0, the LFO does not move and the tap behaves like a simple delay line set to the minimum

delay. The coarse range is 0 to 228 ms; the range 0 to 5 ms is most eective for anging. The ne

range adjusts the coarse range in samples from -127 to 127.

Quantize

This eect produces digital distortion known as quantization noise, by limiting the number of

bits available to the signal. See eect 329 “Aliaser”.

DynamRange (dynamic range) controls how many bits to remove from the signal data words.

The lower the level, the greater the distortion. At 0 dB the hottest of signals will toggle between

only two quantization levels, thereby producing a square wave. Every 6 dB added doubles the

number of quantization levels, reducing the noise and getting closer to the original signal. If the

signal has a lot of headroom (available signal level before digital clipping), then not all

quantization levels will be reached. Range is 0 to 144 dB.

Headroom sets the available signal level before digital clipping. Setting this properly prevents

the signal from getting too loud at low levels of DynamRange. You want to have it match the

amount of level still available above the input signal: this is done by nding the DynamRange

level at which the signal starts getting louder, and setting Headroom to match the DynamRange

value. Range is 0 to 144 dB.

DC Oset adds a positive DC Oset to the input signal, which allows you to alter the position

where digital zero is with respect to your signal. At low DynamRange settings, this can cause the

output to “sputter”. Range is O/-79.0 to 0.0 dB.

LaserVerb

LaserVerb is a type of reverb which produces a delayed train of closely spaced reections, or

impulses. As time passes, the spacing between the impulses gets wider, which creates a

discernible buzzy pitch that gets lower as the spacing increases. The signal can be fed back into

itself to extend the eect.

Dly Coarse is the overall delay length, which controls the duration or decay time. 0.5 sec is a

good starting point. Range is 0 to 1.3 seconds in the 2 DSP unit version of the eect, and 0 to 2

seconds in the 3 DSP unit version.

Dly Fine adjusts the delay with a resolution down to 0.2 ms. Range is -20.0 to 20.0 ms.

Spacing determines the starting pitch of the descending buzz and how fast it descends, by

setting the initial separation of impulses and the subsequent rate of increasing impulse

Kurzweil PC3A7 [218/423] Flanger

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